Billhead: Oppenheimer, M. Mercantile Business, 811 Penn Ave., Pittsburgh, PABillhead from the mercantile business of M. Oppenheimer, located at 811 Penn Avenue. The billhead indicates that an item was sold to Heggarty in Coalport, PA on or around February 13, 1906. The item's description is missing from the record. This item is part of the M Collection.